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An idea from the dev list:
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On Sat, Feb 7, 2009 at 3:41 PM, <serg472@gmail.com> wrote:
> Hello,
> I wanted to share with you a few ideas I have about new simple
> improvements for DisplayTools. I should be able to make patches for
> them if you are interested.
>
> 1. Add new method
>
> isEmpty(object)
>
> that will return true if the object is null or empty (for strings it's
> zero length; for collections, maps and arrays it's zero size). This
> should help with annoying null checks. (Probably a better place for
> this method would be Engine, not Tools)

yeah, not something for tools. would be interesting to have the
Uberspect pretend that every non-null reference has an isEmpty()
method, or perhaps just add 0-length strings, empty collections, empty
maps and 0-length arrays to the list of things that #if( $foo )
considers false.
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